Keith tweeted that he had "Such a blast joining @TheTimeMcGraw and @taylorswift13 tonite at #CMAfest!!!"

Taylor also reporters backstage at CMA Fest she's ready to start writing again. "It's starting," she said, as reported by USA Today. "All the anxiety is starting. When the anxiety starts, the writing happens right after, usually."

One thing's for sure: This country-pop star should have plenty of good material for her new album.